I am installing openvpn on ubuntu 16.04 by following this online post: https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-16-04. After root keys were generated under openvpn-ca/keys, the ./build-key-server server generated nothing but the following output:

:~/openvpn-ca$ ./build-key-server server
Please edit the vars script to reflect your configuration,
then source it with "source ./vars".
Next, to start with a fresh PKI configuration and to delete any
previous certificates and keys, run "./clean-all".
Finally, you can run this tool (pkitool) to build certificates/keys.

There is no interactive process and no key was generated. What is the problem here?

acgtek wrote::~/openvpn-ca$ ./build-key-server serverPlease edit the vars script to reflect your configuration,
then source it with "source ./vars".Next, to start with a fresh PKI configuration and to delete any
previous certificates and keys, run "./clean-all".
Finally, you can run this tool (pkitool) to build certificates/keys.